Direct probing of anode arc root dynamics and voltage instability in a dc non-transferred arc plasma jet. (13th October 2015)

• Record Type: Journal Article
• Authors: Ghorui, S; Tiwari, N; Meher, K C; Jan, A; Bhat, A; Sahasrabudhe, S N
• Is Part Of: Plasma sources science & technology. Volume 24:Number 6(2015:Dec.)
• Publication Date: 2015-10-13
• Subjects: arc root -- non-transferred arc -- arc instability -- plasma jet -- voltage instability; Plasma (Ionized gases) -- Periodicals; 530.44
• DOI: 10.1088/0963-0252/24/6/065003
• Languages: English
• ISSNs: 0963-0252

Abstract

Abstract: The transient dynamics of the anode arc root in a dc non-transferred arc plasma torch is captured through fast photography and directly correlated with the associated voltage instability for the first time. The coexistence of multiple arc roots, the transition to a single arc root, root formation and extinction are investigated for the steady, takeover and re-strike modes of the arc. Contrary to the usual concept, the emerging plasma jet of a dc non-transferred arc plasma torch is found to carry current. An unusually long self-propelled arc plasma jet, a consequence of the phenomenon, is demonstrated.